what is meant by power of a lens? write its SI unit. A student use a lens of focal length 40 cm and another of 20 cm. write the nature and power of each lens.
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The converging or diverging capacity of lens is called its power. Its SI unit is Dioptre.
Each lens of student is convex lens.
Power of 1st lens is 2.5 D
Power of 2nd lens is 5 D
Each lens of student is convex lens.
Power of 1st lens is 2.5 D
Power of 2nd lens is 5 D
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